Fluctuating Amperes on Line Side of Thyristor Control Panel

The forum can eliminate suggestions made by the original equipment supplier over the telephone, thereby saving everyone's time, were they to be listed below, please.

<...Gents...>

Not every user here uses that description.

I feel like this is just noise generated by the high speed switching mechanism...the latency of your measurement device could be dampened perhaps to eliminate this noise but not necessary..

When driving a purely resistive (linear) load, the current should fluctuate with the main frequency and harmonic. Utilizing three phases will significantly minimize the magnitude of the fluctuations. Thyristors are very non-linear devices. All motors (blowers) will vary their impedance with the mechanical load, thus varying the current in magnitude or phase. Spark gaps (ignitor) vary their impedance from an open to a short as arcs form and collapse.

Lastly, the sample rates, phasing, and bandwidth of the current sensing devices are probably not identical.

My question is why Micro logic is not showing almost same current as output current from thyristors to electrical fuel gas heater.

It has to do with the way thyristors control current. A thyristor is a semiconductor device that can turn current on but can't turn it off once it is flowing.

To control current to a device, the thyristor blocks the current when the AC current reverses direction and then after a short time turns it on again. The delay time before it's turned back on controls how much current reaches the load as shown in the figure below.

Your Micro logic is sampling the current at some interval. Instead of reading the average current to the load, it reads either the AC waveform or zero, depending on when the sample occurs in relation to the switching time of the thyristor.

In an engineered installation, the source impedance of the power supply is mathematically modeled, and anti-notching reactors are applied to smooth the effect of the thyristor firing, if necessary.

How did the telephone calls with <...CD Automation...> go, then?